\documentclass[tikz,border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}
\usepackage{tikz-feynman}
\begin{document}

\begin{tikzpicture}[baseline]
	\draw (0,0)--(2,0);	\draw (0.5,0) to [out=90,in=90,looseness=1.5] (1.5,0);
    \draw (0.5,0) to [out=-90,in=-90,looseness=1.5] (1.5,0);
\end{tikzpicture}

\end{document}